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Timing of insult leading to visual impairment, severe visual impairment, or blindness
Percentage totals exceed 100% due to multiple causes for some children. Children in the undetermined category had insults arising from either the prenatal or perinatal period, but the timing could not be reliably ascribed to a single cause with the information provided. *p<0·0001. †p=0·0044 for the difference in two proportions test.
